{"id":"502edf13-170f-4993-bd8a-c9af7b500f6c","shortId":"Sf8FnK","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/wire/140` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform offers endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point. However, the specific endpoint probed here (`/api/v1/wire/140`) does not clearly map to any of these named services — its description is simply \"Premium API Access\" with no further documentation on what data or functionality it returns.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the `/wire/140` endpoint actually does. The endpoint is live and responds with a valid x402 challenge, but without documentation it is unclear what payload to send or what response to expect.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","wire API","premium API access"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.","The endpoint path /api/v1/wire/140 does not correspond to any of the named services listed on the homepage.","No OpenAPI schema or request/response examples are provided anywhere.","It is unclear what this endpoint actually does or returns — 'Premium API Access' is the only description."],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/140","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/wire/140","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what the /wire/140 endpoint does, what inputs it expects, or what it returns. No OpenAPI schema, no examples, and the docs pages are empty. This is effectively a stub 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'/api/v1/wire/140':56,165 '/docs':199 '/pricing':201 '/readme':203 '/request':13,28,156 '/wire/140':230 '0.02':12,27,78,155 '000':72 '20':71 '402':66 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,92,182 'across':112 'actual':232 'advertis':83 'ai':122 'analysi':126 'analyt':116 'api':5,20,38,61,85,181 'attach':95 'base':8,23,51,73 'broader':108 'call':4,19,80 'caller':93 'categori':114 'challeng':67,244 'classif':129 'clear':168 'connect':209 'content':215 'convers':146 'data':115,119,189 'descript':177,226 'document':186,194,247 'embed':130 'endpoint':55,111,149,162,231,235 'estim':140 'exampl':223 'exchang':135 'expect':259 'export':120 'extrem':196 'feed':134 'financ':131 'four':113 'function':191 'gas':139 'generat':147 'geocod':144 'header':100 'howev':159 'i.e':77 'infrastructur':142 'insight':121 'instant':91 'json-response' 'key':86 'learn':124 'limit':89 'list':58,151 'live':237 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':123 'map':169 'metric':117 'name':174 'network':9,24,52 'no-api-key' 'offer':110 'openapi':219 'page':204 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payload':252 'payment':48,99,105 'per':3,18,36,79 'platform':6,21,39,82,109 'point':158 'premium':60,180 'premium API access' 'price':133,157 'probe':163 'prompt':211 'proof':106 'protocol':44 'quot':138 'rate':88,136 'render':206 'report':118 'request':37,68 'request/response':222 'respond':239 'respons':257 'return':64,193 'schema':220 'send':254 'sentiment':125 'servic':175 'simpli':94,179 'spars':197 'specif':54,161 'substant':214 'summar':128 'text':127 'token':137 'unclear':250 'unit':74 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':143 'valid':103,145,242 'via':10,25 'wallet':210 'web3':132 'wire API' 'without':246 'x':98 'x-payment':97 'x402':11,26,43,104,243 'x402 API' 'x402-payment'","prices":[{"id":"2bd7e4d6-5b51-4bc6-9753-0deb2a19aacd","listingId":"502edf13-170f-4993-bd8a-c9af7b500f6c","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/wire/140","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:47.176Z"}],"sources":[{"listingId":"502edf13-170f-4993-bd8a-c9af7b500f6c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/140","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:47.176Z","lastSeenAt":"2026-04-22T02:31:40.466Z"}],"details":{"listingId":"502edf13-170f-4993-bd8a-c9af7b500f6c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/140 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/wire/140"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/wire/140"}],"useCases":["Programmatic access to pay-per-call endpoints without API key management","Agent-driven API consumption with automatic USDC micropayments on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that need keyless, pay-as-you-go API access","Users who want to avoid subscription commitments for occasional API calls"],"notFor":["Production workloads requiring documented, well-specified API contracts","Users who need detailed request/response schemas before integrating","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:31.212Z"},"updatedAt":"2026-04-22T02:31:40.466Z"}}